55561717 has 4 divisors (see below), whose sum is σ = 55598400. Its totient is φ = 55525036.

The previous prime is 55561711. The next prime is 55561733. The reversal of 55561717 is 71716555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71716555 = 5 ⋅14343311.

It is a cyclic number.

It is not a de Polignac number, because 55561717 - 2²³ = 47173109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15967 + ... + 19132.

It is an arithmetic number, because the mean of its divisors is an integer number (13899600).

Almost surely, 2^55561717 is an apocalyptic number.

It is an amenable number.

55561717 is a deficient number, since it is larger than the sum of its proper divisors (36683).

55561717 is a wasteful number, since it uses less digits than its factorization.

55561717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36682.

The product of its digits is 36750, while the sum is 37.

The square root of 55561717 is about 7453.9732357985. The cubic root of 55561717 is about 381.5855198494.

The spelling of 55561717 in words is "fifty-five million, five hundred sixty-one thousand, seven hundred seventeen".